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Which one would you like to try? Or do you have any specific questions about these options?
You're looking for the best Khan Academy answer revealer. Here are some top-rated options:
Images of the Deep Field, Spiral Galaxies, and Elliptical Galaxies courtesy of ESA/Hubble & NASA
Image of the CMB courtesy of ESA/Planck
Image of the Black Hole courtesy of NASA
Image of the SDSS Telescope courtesy of Sloan Foundation
Images of Galaxies shown over map courtesy of Nasa-Sloan Atlas
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